Title:
PRODUCTION OF SPINDLE-TYPE TITANIUM DIOXIDE
Document Type and Number:
Japanese Patent JP3806790
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a useful method for producing spindle type rutile titanium dioxide having a major axis of 0.15-0.30μm and a major axis/minor axis ratio of 2-8.
SOLUTION: This method for producing spindle type titanium dioxide comprises (a) treating titanium dioxide hydrate with a base and subsequently neutralizing the obtained titanium dioxide hydrate slurry with hydrochloric acid into a pH of 6-9; (b) heating the neutralized titanium dioxide hydrate slurry at 40-60°C and subsequently adding hydrochloric acid to the heated slurry at a rate of 0.05-0.20kg/min (converted into 100% HCl) per kg (converted into TiO2) of the titanium dioxide hydrate contained in the slurry in such an amount that the concentration of hydrochloric acid in the slurry is 32-48g/liter converted into 10% HCl; and (c) further heating the mixture, ageing the mixture at 90°C to the boiling point, neutralizing the aged mixture, filtering the neutralized product, washing the separated solid products with water and subsequently drying the product. The obtained titanium dioxide is improved in detects related to dispersibility, and has physical properties such as good visible light transparency and good UV light-shielding ability.
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Inventors:
Maki Go
Kawamoto Masahiro
Mitsuo Harada
Kawamoto Masahiro
Mitsuo Harada
Application Number:
JP31886996A
Publication Date:
August 09, 2006
Filing Date:
November 13, 1996
Export Citation:
Assignee:
TAYCA CORPORATION
International Classes:
C01G23/053; C08K3/22; C09D7/12; A61K8/29; (IPC1-7): C01G23/053; //C08K3/22; C09D7/12
Domestic Patent References:
| JP4214030A | ||||
| JP9175821A | ||||
| JP7138021A |
Attorney, Agent or Firm:
Akaoka Michio